Birds in Jeopardy: The Imperiled and Extinct Birds of the United States and Canada, Including Hawaii and Puerto Rico by Paul R. Ehrlich, by David S. Dobkin, by Darryl Wheye, illustrations by Darryl Wheye

A Shadow and a Song by Mark Jerome Walters

Extinction: The Causes and Consequences of the Disappearance of Species by Paul Ehrlich, by Anne Ehrlich

Where Have All the Birds Gone? Essays on the Biology and Conservation of Birds That Migrate to the American Tropics by John Terborgh

Federal and State Endangered Species Expenditures: Fiscal Year 1990 compiled by the US Fish and Wildlife Service